<template>
    <div>
        <!-- v-model 双向绑定 -->
        <div class="search">
            <input v-model="keyword" type="text" class="search-input" placeholder="请输入城市名或拼音">
        </div>
        <div class="search-content" ref="search" v-show="keyword">
            <ul>
                <li
                class="item border-bottom"
                v-for="item of list"
                :key="item.id"
                @click="handleCityClick(item.name)"
                >{{item.name}}
                </li>
                <li
                class="item border-bottom"
                v-if="hasNoData"
                >
                    没有找到匹配项
                </li>
            </ul>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapMutations } from 'vuex'
export default {
    name: 'CitySearch',
    props: {
        cities: Object
    },
    data () {
        return {
            keyword: '',
            list: [],
            timer: null
        }
    },
    methods: {
        handleCityClick (city) {
            this.changeCity(city)
            this.$router.push('/')
            this.keyword = ''
        },
        ...mapMutations(['changeCity'])
    },
    // 侦听器
    watch: {
        keyword () {
            // 函数节流
            if (this.timer) {
                clearTimeout(this.timer)
            }
            if (!this.keyword) {
                this.list = []
                return
            }
            this.timer = setTimeout(() => {
                const result = []
                for (let i in this.cities) {
                    this.cities[i].forEach((value) => {
                        if (value.spell.indexOf(this.keyword) !== -1 || value.name.indexOf(this.keyword) !== -1) {
                            result.push(value)
                        }
                    })
                }
                this.list = result
             }, 100)
        }
    },
    computed: {
        hasNoData () {
            return !this.list.length
        }
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.search, {click: true})
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .search
        height .72rem
        padding 0 .1rem
        background-color $bgColor
        text-align center
        .search-input
            box-sizing border-box
            width 100%
            padding 0 .1rem
            height .62rem
            line-height .62rem
            border-radius .06rem
            color #888
    .search-content
        position absolute
        top 1.58rem
        left 0
        right 0
        bottom 0
        overflow hidden
        z-index 1
        background-color #eee
        .item
            line-height .62rem
            padding-left .2rem
            color: #333
            background-color #fff
</style>
